Abrading instrument



NOV. 22, 1938. J w GALLO 2,137,61U

ABRADING INSTRUMENT Filed Jan. 9, 193'? l atented Nov. 22, 1938 UNITED STATES PATENT OFFICE 4 Claims.

My invention relates to abrading implements such as files, whetstones and the like and it has for its object to provide an improved implement of the character indicated.

More especially the invention provides an abrading implement of the character described, or a holder for such an implement, provided upon the side thereof with supporting calks so that when the implement is placed upon a bench or the like the work may be slid back and forth thereon while the calks hold the implement against moving with the work.

To these ends I have provided an improved abrading implement having the novel characteristics set forth in the following description, the several features of the invention being separately pointed out and defined in the claims at the close thereof.

In the accompanying drawing:-

Fig. 1 is a top plan view of a bench file constructed in accordance with this invention.

Fig. 2 is a side elevation, partly in section, of the bench file shown in Fig. 1.

Fig. 3 illustrates another form of bench file.

The embodiment of my invention illustrated in Figs. 1 and 2 comprises a hardened rectangular metal file member ID formed with four holes ll extending therethrough, one near each corner, each of said holes ll being formed at its opposite ends with conical countersinks l2.

The holes H are provided for the reception of screws 13 having conical heads adapted to fit within the countersinks l2 so that the top surfaces of said heads are fiush with or below the level of the top of the file.

These screws I3 serve to fasten calks M in position against the under side of the file member I 0, each calk being formed with a threaded socket l occupied by its screw l3; with a conical upper end that is seated Within one of the countersinks I2 upon the under side of the file member, and with a conical pointed lower end.

Thus when the file member is placed upon a bench with the calks I4 resting in engagement with the latter the work to be operated upon may be shoved back and forth on the file member while the calks serve to hold the latter securely against displacement on the bench.

The file member Ill may be formed, as shown, with abrasive surfaces upon both sides thereof, and it will be clear that when one side of the file becomes dull or worn the screws I3 may be removed from the holes II and reversed so as to secure the calks H in position upon the opposite side of the file from that shown. Thus when the file is returned to the bench the calk will support the same in reversed position from that shown.

In the embodiment of my invention shown in 5 Fig. 3 the file member ID is formed with four holes Ila, one near each corner thereof, each of which is countersunk as at [2 at its opposite ends and also threaded. Into each hole I la is screwed a calk member Ma which may be an ordinary machine screw having a pointed end anda countersunk head as shown.

What I claim is:

1. An abrading implement comprising a file provided upon its opposite sides with abrading 1.3

surfaces, said file being formed with a plurality of holes extending therethrough; calk devices reversibly mounted within said holes and adapted to support said file upon a bench or the like with either of said abrading surfaces uppermost and to hold said file against movement on said bench or the like while the work is moved back and forth thereon.

2. An abrading implement comprising a file having an abrading surface, said file being formed with a plurality of holes extending therethrough; a screw occupying each of said holes and having a head whose top is disposed below the plane of the abrading surface of said file, and a pointed calk member; secured in position against the under side of said file by said screw.

3. An abrading implement comprising a file having an abrading surface, said file being formed with a plurality of holes extending therethrough each of which is countersunk at its opposite ends;

secured in position within the other countersink of said hole by said screw.

4. An abrading implement comprising a file made upon its opposite sides with abrading surfaces, said file being formed with a plurality of holes extending therethrough each of which is countersunk at its opposite ends and also interiorly threaded, and a screw within each of said holes and having threaded engagement therewith, said screw having a head at one end which occupies one of said countersinks and a pointed extremity at its opposite end to serve as a calk.

JOHN W. GALLO. 

